Harry w



(No Model.)

H.v W. BOLENS.

CHAIR.

ATENT FFIGEa HARRY IV. BOLENS, OF PORT \VASHINGTON, WISCONSIN, ASSIGNOR,BY DIRECT AND MESNE ASSIGNMENTS, TO THE GILSON MANUFACTURING COMPANY ANDJAMES M. MORGAN, OE SAME PLACE.

CHAIR.

SPECIFICATION forming part of Letters-Patent No. 585,424, dated June 29,1897.

Application filed April 2 Z l 8 9 5 To all whom it mayconcern:

Be it known that I, HARRY WV. BOLENS, a citizen of the United States,and a resident of Port \Vashington, in the countyof Ozaukee and State ofWisconsin, have invented certain new and useful Improvements in Chairs;and I do hereby declare that the following is a full, clear, and exactdescription thereof.

My invention has for its object to cheapen the production of chairs oranalogous devices, in which provision is made for a screw adjustment ofseat-supportin g spindles in'a vertical direction.

A further object of the invention is to provide for free rotation of thechair-seats and to prevent automatic descent of theirsupporting-spindles.

These objects I attain by certain peculiarities of construction andcombination of parts, hereinafter set forth with reference to theaccompanying drawings and subsequently claimed.

In the drawings, Figure 1 represents a vertical transverse section onthe plane indicated by line 1 1 in the succeeding figure and illustrates the essential features of my invention. Fig. 2 represents a planview on line 2 2 in Fig. 1.

Referring by letter to the drawings, A represents a chair-base castinghaving a smooth bore for the reception of a seat-supportingscrew-spindle B, the latter being provided with a longitudinal groove b,engaged by an inwardly-extended spline c, constituting a part of acollar C, that surrounds the spindle V and rests on the base-casting.

The periphery of the collar C is preferably beveled, and anadjusting-nut D on the spindle B is provided with a bottom recess intowhich said collar fits. By having the collar and the nut-recess beveledI obtain a wedging engagement, it being desirable to have as tight a fitas possible when the chair is occupied and yet provide for an easy slipof the nut or collar when it is necessary to adjust the elevation of thespindle.

The depth of the recess in the nut D is always such that said nut is outof frictional contact with the base casting, this being one of theessential features of my invention, as

Serial No. 54%,655- (No model.)

will hereinafter appear. The nut D is also provided with an exteriorannular flange d, opposed by a guard on the base-casting, in order toprevent separation of the chair when the latter is lifted by the seat.As a matter of preference the nut-guard is a plate E, simi lar ingeneral contour to the top of the basecasting, on which it is secured byscrews e, run down through said casting into the legs F of the chair,said plate being provided with a central opening of sufficient area topermit its being put in place over the nut and so shaped as to presentan annular lip f in opposition to the flange on said nut, provisionbeing made to prevent frictional cont-act of the nut-flange and itsguard, except when a lift of the chair by the seat takes place.

A hand wheel G is herein shown driven onto the adj usting-nut tofacilitate operation of the latter said hand-wheel being positionedafter the guard-plate is put in place.

In order to facilitate placing the spindle B in position, thescrew-thread thereon may be chamfered away from the usual beveled end adistance suiiicient to insure a full width of said thread coming intocontact with the guide-spline, whereby a ready engagement of thelongitudinal spindle groove with said spline is made positive andbinding avoided. As a matter of preference the length of chamfer,including the usual bevel-point of the spindle, is equal to the depth ofthe threaded portion of the nut.

I have shown a portion H of an ordinary seat-spider on the upper end ofthe spindle, and it is to be understood that the connection is a rigidone. Consequently said spindle constitutes the seat-pivot, it being alsounderstood that said spindle or the nut there* on must be held while theother is turned in order to vary the elevation of the chair-seat.

The chair-seat having been adjusted to the desired elevation, rotationof its supportingspindle will also rotate the collar C, and the nut Dbeing in clutch with said collar, out of frictional contact with thebase casting and the guard, it also rotates, but has no leverage on saidspindle. Therefore the latter cannot work down. It also follows that thegreater the weight there is on the chair-seat the tighter said nut willwedge on the aforesaid collar. However, the opposing beveled surfaces ofthe collar and nut permit an easy slip of one on the other When itisdesirable to adjust the elevation of the chair-seat.

Inasmuch as the base-castings do not have to be tapped or counterbored Ieffect a material saving in the cost of production, and it Will also beseen that the construction and arrangement of parts are such as tofacilitate knockdown shipment of chairs, this being an important item tothe trade.

Having thus described my inventiomwhat I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of a chair-base casting, a splined collar loose onthe same, a seat-supporting screw-spindle having a longitudinal grooveengaged by the collar-s pline, and-a nut on the spindle fitting thecollar out of contact with the base-casting.

2. The combination of a chair-base casting, a splined collar loose onthe same and having a beveled periphery, a seat-supporting screwspindlehaving a longitudinal groove engaged by the collar-spline, and a nut onthe spindle having a beveled recess of limited depth engaging thecollar.

3. The combination of a chair-base casting, a splined collar loose onthe same, a seat-supporting screw-spindle having a longitudinal grooveengaged by the collar-spline, a nut on the spindle fitting the collarout of contact wit-h the base-casting, and suitable means for preventingvertical displacement of the nut.

4. The combination of a chair-base casting, a splined collar loose onthe same, a seat-supporting screw-spindle having a longitudinal grooveengaged by the collar-spline, an annularly-flanged nut on the spindlefitting the collar out of contact with the base-casting, and a guard onsaid base-casting opposing the nut-flange.

5. The combination of a chair-base casting, a splined collar loose onthe same, a seat-supporting screw-spindle having a longitudinal grooveengaged by the collar-spline, an annularly flanged nut on the spindlefitting the collar out of contact with the base-casting, and a platethat is fast on said base-casting and has an annular lip opposing thenutflange.

6. The combination with a base casting having a vertical aperture, of afreely-revoluble collar supported by said base-casting, a nut supportedon and releasably engaging the collar, a screw-threaded chair-spindleeX- tending through the nut and the collar, the screw of the nutengaging the screw of the spindle, and means holding the collar torevolution with the spindle,while permitting vertical movement of thespindle in the collar.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in the county of Milwaukee and State of isconsin, in thepresence of two witnesses.

HARRY XV. BOLENS. Witnesses:

N. E. OLIPHANT, HENRY DANKERT.

